Differentially fed CP antenna with quasi‐self‐complementary semicircular‐ring structure | Zendy

Lee ChingHer | Zendy; Hong WanChu | Zendy; Chen WenJie | Zendy; Hsu ChungI G. | Zendy

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Differentially fed CP antenna with quasi‐self‐complementary semicircular‐ring structure

Author(s) -

Lee ChingHer,

Hong WanChu,

Chen WenJie,

Hsu ChungI G.

Publication year - 2019

Publication title -

microwave and optical technology letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.304

H-Index - 76

eISSN - 1098-2760

pISSN - 0895-2477

DOI - 10.1002/mop.31635

Subject(s) - axial ratio , physics , optics , antenna (radio) , impedance matching , radiation pattern , return loss , electrical impedance , circular polarization , electrical engineering , engineering , microstrip , quantum mechanics

This article presents a new design of a common‐mode suppressed differentially fed circularly polarized (CP) antenna using a quasi‐self‐complementary (QSC) structure. The antenna radiating element consists of a semicircular‐ring radiating patch and its complementary radiating slot counterpart. The design idea for producing CP radiation is based on field orthogonality of the QSC structure. For better impedance matching, a fan‐shaped notch (stub) around the feeding position was cut from (implemented in) the semicircular radiating patch (slot). In addition, to improve the axial ratio, a QSC semielliptical structure is embedded in the central area of the antenna. For the designed differentially fed CP antenna, measurement shows that the differential‐mode (DM) operating band with return loss >10 dB covers 4.76‐6.38 GHz. The measured DM 3‐dB axial‐ratio band is 4.95‐5.43 GHz. Also, very good common‐mode (CM) suppression is observed with the measured CM reflection coefficient >−1.21 dB in 4.50‐6.5 GHz.

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